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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad547ec3b8c3480c10006adff1ff2c9e2aed519e84c1d71c62e1a202df91c0d8' 
  AND token = 'NbhaGpH2Yi+VoWs4fJOoSKqyqXGzLkr0Yyg/U5wX7Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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