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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936073488324d7070de2c8bc6443628d9eabc5053f8a663169dcd1e3ef5cd258' 
  AND token = 'ZlbSVVcmjm1P7C704N/VTJPy4JACYl7YVkwDuA3Aybs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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