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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cee4b9c8b7c7d63780cde0b34af666be5b9d5f0b0dd4e6bc19bd57434840585' 
  AND token = 'O0Hn3a/QV61pb1CGQsdnfc/w6kwpAlUMjBwXwRKiFF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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