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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fd51d86107a09dc23f9df2ee3eb9f540c55639eeedabde104a20df06341bae' 
  AND token = 'kBWVwfJ6J00VNSNtKp8VwSBXn1z/SOjqcyNaIcjSpSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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