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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a092f7195fbe069372916a7271c6ed4d4c32a7b8de2760a03eb56a06c9b7813' 
  AND token = 'a63P0hV9YrX/NOPHyZE9QeWiXTjPFqbGL81LS1fCyTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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