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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737f15edc25a8eedab44ef3afc3308b5eacd568bc9ee83a975d47b89c84dea3c' 
  AND token = 'l1fSsT/sNbWYZIiezTSoD9l6pzoXWXaZ6mme5YT2N74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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