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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea26033e259a4bdba66bd2c01015c01c98c732eca8031ca4eaa6dbf74533054' 
  AND token = 'bQLN6fIeY/P4tx6ytRvskRcio5jAERnXdYyDqtSeEYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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