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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950aedf0abf139ec128c062f53681d9ab7f17dc24047aff9008d35ec911d9c26' 
  AND token = 'JbJIy3MgJtKX5BZG8m5qf/t9/4QEIYY9cREYeuSZyd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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