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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c8231f42b5ef134fc9f331a62582507d985009b0dc6813212ea26a0a98866e' 
  AND token = 'UAFKeDZWr8waGW8WY7PMPLmeAQnlFyWcSyMxYz47Kec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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