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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f203893c9212cc407b498a14a1fef2403806a97c01e1ef294a9804e69ce5bc55' 
  AND token = 'jSXWCf9dXdc98saojE1dP2UW4Y4yltO0HoasF2+BqSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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