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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c285cfab5b0791546535bdb2e3dec8a6b3fa3bfd8748edb0f9f8efc4fd2904f' 
  AND token = 'RdG2Dg4rneBDvL+w2gsdwgU341J8POpSq8xI7sKW1sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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