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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563c1132f69107c68838b81a5df917e0475d26cad401ac29affd94d7887bddde' 
  AND token = 'PCdquhjvNandMdk9ClTPRD0aK2RaRFeO+9DyliJX1fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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