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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586104bd0b645ff9e4f58efd61b5613fab729727c79971b94f3d16f74361e5ed' 
  AND token = 'FEemgTyCZI7aTOJJfafof00jWDoWP+Hnf7WHYELjO74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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