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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d086ae67c9374960bf6c2fb85d74e601a1fb9af4acb30b22661fce20c1a5aa0' 
  AND token = 'eQTRL0wDIxcug5Ea8FuXRa+X9/iPU3r0v5jjNMXJ6YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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