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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b365dbb45f1cc4d7c594abc2a82961fe94757b8c06701b0a2082187c588ccddf' 
  AND token = 'qDb4wmtxwhwN8cn2jthN4dG4KG8aXnXDJw66oDq7640=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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