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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bbd91d7761dd5571a9fa601ce4a783d484aba4daa0ed88a30d7484eae04f05' 
  AND token = 'lpTHuuZwn1IjcmXMKaKDUj13SgT7TPo4JOFvUEnHcLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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