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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a144e4212aef38c1630ffc1837a4494a67779456521c93ecd263245554b6d8' 
  AND token = 'cMAP3C1pobD1F71eozTi/UUd3LdBqdjOAdIO8eEN+zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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