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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15e6e7a0a479602c629e3f3fb1b5cc29cd5e034943d5fe541a82fe62041e8f4' 
  AND token = 'Bo2MMJQMNnoKaLCym8g1P8ZZiV9kM7OjR1JL9ntNB9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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