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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f25b735a5aaf0db60426beef630b3902ad3a146701247b8b263e12f79ee66a' 
  AND token = 'jpzzW2jxb8DfC3B2alGCwCztxNnbs7vi5VGAj8rwio8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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