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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cde6ffce600bdfdcb624390b8db4a53c7f723c1875d522ea4820f98c06214f' 
  AND token = 'CSzT6y+Hecm2PkWGZA28ml9mA07LSDC5m5Q791ZjI5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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