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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be7fc33efcbfcc1d324c933ea14c1837d954004b9a6766ff8ec0710ca4b2ed9' 
  AND token = 'BW1f/BkhcCQYETykvBvQNesdK9Qd+JPAbotA8XLNL94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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