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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239a2ac9e7e7330a58b87d32047d43ca7e0f487cda0b1c52637b38c8b3edf296' 
  AND token = '82T5neVYsiRmvrjgoH1njkncOXVgcV0Pa3PjkDDbp74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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