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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4d8daf39d5db1279d884dd4478071a7c5760826c67ae3a6dcada49847f7e07' 
  AND token = '69HILPXlg0/Btq9YbcDJw9JBTiTgzZo/xpuZ7JaLxLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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