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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f0966be760dfde68970c409abba2309032634f81c0f79f58d0b48fe49678d3' 
  AND token = 'F5AYdHE6BrK0DQuiynNG28iFY3YxlkpH5Fpo/IHP8No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00163

JSON explain

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