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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8687317500f06d7d6dad104e2b6e4c6bdb2a1b55155d278954ac078359a21605' 
  AND token = 'RDgo279+A3g1iYbxmKRBZCQV28j+BApK/AcZZ0KR/RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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