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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee8193bf8dee430f54e25fc78c0dfa073099e6f430236ac84307bb351c9c663' 
  AND token = '07IR4FlW7a9kcN1kaT4697y4J1+5p6VeV7t4t92IzzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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