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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e2e79bedec94c2874528f17ebdeb727cda6cd66b7f2e03b7d01b90278f4938' 
  AND token = '4aXLZ4zpvYE/f5JbWUkRqUaZRCtjjhGBNEmqdbH8IxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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