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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214e98aab3192ac0259648eaa3055a6836534a9cf95a345982caeb80e2ac7d22' 
  AND token = 'G/XV5kYCtxWP/JTKT8QbzxB1xh4yEQV1P4cnyH6XqEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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