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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268bbcb8054fc58d9cd434e14487f6ef6099878c2e35a428119c1c904b916e6b' 
  AND token = '3tMUXf5rogSlxHjkldgjoLn7z7iwnNmo03LSn6Iov6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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