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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0745799fb7c2da2ce0e37dd2069bf0ecd11bd448cfdb3cd2628d5056c5eca0d5' 
  AND token = 'l/ysUDeTBMGFthVJJ0z8e5SpxOrPAJMXhIxFbQFNdLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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