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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088d040507e50e6fe2954aea0d16e69f18d31a32e26b6fd86133e0636ecf92f9' 
  AND token = 'GF65IyYq5cHaq8ITq5QD5//vcw/NT8c/Tgqsf6fxBqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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