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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0db6a39489569dd78c5097f7f4bff408a307e743e6d881f5e4f550d7feb4c0' 
  AND token = 'jG4yImcvoaOOHP2gRHnUnrSiB6H0PdoV6abPgYLSE9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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