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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c096fa246131284079ecabc7c154be7d9faeaccdc66bd6ccc0d3c8926ec3a49b' 
  AND token = '6iea36rrnyDH7osdF/69j9Dn1v5RijEio/pSTJC2BiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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