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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0370e63647eecdb970a67243c0d3430a60e6de922eb8479db26b4092b5b4131' 
  AND token = 'vmOSVQWfysRmZqR1q24CbGAUBboknym/qT8gKZdYnuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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