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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1318e77b2d0d1065396e67315467971d160ce81ac888b80913c63f8fc6a1b256' 
  AND token = 'o7mFS3FW7L7TBybXBRUEuZgYAfMA+GnytLepsQMkSWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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