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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c835152077760f17b0aa55814815a4df4b51908d94bb8a2fa6f4924f26c3512b' 
  AND token = '5Y9wFQIAqBW1IRFuuoPdbGX/rxQmsjGrM982q6HOFyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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