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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f31ef20ea51e8771691fbe85cf2775cbe8bb8294c2c9955ab6142ade012d08' 
  AND token = 'yj9rhTwwuoxQYu9QA0nG7joxTnpltpvUs5Q6PATxgSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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