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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e8982f07ce3d7b5b130207b6e750e9876331082a3e1d0b9fe3ac7b105e4395' 
  AND token = 'TQFHOBnD37B93u0L6Spt99YuZLub3HwG7/+hqI1Gypo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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