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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041c26beb1e750f44839967026cc7460af25ee758c5fa9e642de3d3a268b71f7' 
  AND token = 'O9ZGgoSad/QJr2Rv4AfGLHHK3Qb+W6scjt4Y82UM7Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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