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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1555fe0006c3e461f3ea7238cb6cfe79a160c1809a89f7abc2a208a29d7d890f' 
  AND token = 'WmhAVfq0DB1MJBNEwXBMDPcYE2YWjQ30VZuAH5BjZTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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