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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2968efe1d338fa8e86e4ac9705931da858c8b9b190aa79944360a5c50b338943' 
  AND token = 'vU4qRyU25SlDoiNaqXeiybJqhIDPkT4X3f8+V0iir4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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