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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e81cf874bba66209f0ee90ae530e63ac16d0bdc06ce2f276ec2e9c2c33f536c' 
  AND token = 'GhTqPMZiCoH7InT9lZqx30J459lM9Pt9PrcH+Ew1rF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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