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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71e7eac75a931c61cabbc9fbd74c219dae4fd38c57059bb0aef0565eba5f0e7' 
  AND token = '9YR5rg3Mwr/PRRDNVpCANTfs3lqqtVAsdUyy36caWyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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