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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be84f7b34de828364406ad5a03b89a62d108d1e6182522f278af0f7e645fad56' 
  AND token = 'tk34kn2KGCZBN5VeK9wUvimTXo2/1tBcZJJVwgcDNb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}