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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7105c7e1fa6d83f6c7d210f8f9b4ab8fff99405d1d01e40eaefaabfc39ed4b77' 
  AND token = 'YejiTPRoXcvtEmvSDI5mD0AXUAqcyDpRbfrfzM5KJlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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