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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fd0a9a7387d9b5405b8b89bc401b088148f812dc2647abbdb55d6f4b8deca0' 
  AND token = 'OQnobkJJn572WlohV+tmUuCevcp3tT1PkEBpct/lY+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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