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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef2ac9ac0b78bcd39297d089126821a93540421ee19718d8808f78de7c547ce' 
  AND token = '/eF5tHtj3XYuHwnn8mwxS5MTck0QLc72ldVil1G2SVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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