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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02c257037453767fb624686b6a22477515c4542d3f5c0c1ee96a87838591a53' 
  AND token = 'mT+O/6iONTTdCOz/Uci9ch98o2u+jroJk0m8hkIDq8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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