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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b0768bc4a9f3eefcd5a5f9c4fc7d5231d4ca77d0c136fd924fe5f3f6802b2b' 
  AND token = 'uSokheNu9JRitIjDCVuQ3mntuFqxyrHGCJNhCl4TtD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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