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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80fa1b8d03f50d7f8ad3dcef9618e4cdfffe7ce5bbe90f38ec2c03371dd38d29' 
  AND token = 'e55mrMjyKuhAsL/gR1oyG5g3DozLnYGW1/X3iYlwNP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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