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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9eb6a919fe2006c0ef1ec22de80b2311dfd7092cab2c68fbc4c5a525a2fab99' 
  AND token = 'URLSmhUWY+4rG0UXc8qi62KG5ftVGEfMpULKQXB+0PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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