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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7896f8286b2582102abc0d3c8797ae4725516d7f32c5d5d74b5f6c22e666dc2b' 
  AND token = 'gdZxSsgb5Lzlh+UOSoucqEWkr4D+D3enc+CAwihX7ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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