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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6351d1357970a0a2806ee664e67f64fd400ed1de07254d5d69b437f9c766fb42' 
  AND token = '9Evq64jBzzLQgAl87v8imWd8zPofjawHYdtqUutXjTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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