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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94243bd287b68a07d8106fb4d29b1d13303a0f04557925aff7fdc1786517094b' 
  AND token = 'l6C3aw/kzyx/wel85LQNs+Zogyzo/ocP5Fa0uXbLJSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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